From 1ec85ca0956532b68ae386a735864cf40ec1a828 Mon Sep 17 00:00:00 2001
From: Shadowfacts <me@shadowfacts.net>
Date: Sun, 7 Nov 2021 15:10:18 -0500
Subject: [PATCH] Use video thumbnails from API when possible

---
 Tusker/Views/Attachments/AttachmentView.swift | 29 +++++++++++++------
 1 file changed, 20 insertions(+), 9 deletions(-)

diff --git a/Tusker/Views/Attachments/AttachmentView.swift b/Tusker/Views/Attachments/AttachmentView.swift
index d23b0098..cb987c62 100644
--- a/Tusker/Views/Attachments/AttachmentView.swift
+++ b/Tusker/Views/Attachments/AttachmentView.swift
@@ -184,15 +184,26 @@ class AttachmentView: UIImageView, GIFAnimatable {
     }
     
     func loadVideo() {
-        let attachmentURL = self.attachment.url
-        // todo: use a single dispatch queue
-        DispatchQueue.global(qos: .userInitiated).async {
-            let asset = AVURLAsset(url: attachmentURL)
-            let generator = AVAssetImageGenerator(asset: asset)
-            generator.appliesPreferredTrackTransform = true
-            guard let image = try? generator.copyCGImage(at: .zero, actualTime: nil) else { return }
-            self.source = .cgImage(attachmentURL, image)
-            self.displayImage()
+        if let previewURL = self.attachment.previewURL {
+            attachmentRequest = ImageCache.attachments.get(previewURL, completion: { [weak self] (data, _ )in
+                guard let self = self, let data = data else { return }
+                DispatchQueue.main.async {
+                    self.attachmentRequest = nil
+                    self.source = .imageData(previewURL, data)
+                    self.displayImage()
+                }
+            })
+        } else {
+            let attachmentURL = self.attachment.url
+            // todo: use a single dispatch queue
+            DispatchQueue.global(qos: .userInitiated).async {
+                let asset = AVURLAsset(url: attachmentURL)
+                let generator = AVAssetImageGenerator(asset: asset)
+                generator.appliesPreferredTrackTransform = true
+                guard let image = try? generator.copyCGImage(at: .zero, actualTime: nil) else { return }
+                self.source = .cgImage(attachmentURL, image)
+                self.displayImage()
+            }
         }
         
         let playImageView = UIImageView(image: UIImage(systemName: "play.circle.fill"))